Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.c > #96123

Re: What about my last date functions? there are some error?

Path csiph.com!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From Keith Thompson <kst-u@mib.org>
Newsgroups comp.lang.c
Subject Re: What about my last date functions? there are some error?
Date Tue, 08 Nov 2016 12:05:29 -0800
Organization None to speak of
Lines 31
Message-ID <lnh97hrb3q.fsf@kst-u.example.com> (permalink)
References <gh932ctlqkebuct208fqbbc7rdak1b2c1o@4ax.com> <87d1i69r5w.fsf@bsb.me.uk> <nvsd9k$nd4$1@dont-email.me> <871sym9dpv.fsf@bsb.me.uk> <nvstum$jt5$1@dont-email.me> <87bmxp978j.fsf@bsb.me.uk> <nvt73j$o68$1@dont-email.me>
Mime-Version 1.0
Content-Type text/plain; charset=us-ascii
Injection-Info mx02.eternal-september.org; posting-host="e43f89eff67778d2e2548cd041b513fe"; logging-data="31840"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18wqfHqndtCzNLuoNtx4OiC"
User-Agent Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux)
Cancel-Lock sha1:GDRMErjAg5RlKyh5NlJQorcXa5s= sha1:S7MjNQUcwAjsIEHZC1Amg8xo7NA=
Xref csiph.com comp.lang.c:96123

Show key headers only | View raw

Richard Heathfield <rjh@cpax.org.uk> writes:
> On 08/11/16 18:06, Ben Bacarisse wrote:
> <snip>
>> I suspect your preferred code will not go that far
>> out on exactly the same systems that have a limited range of time_t
>> values.
>
> You're right, of course. Nevertheless, it's still a win over time_t. 
> Let's assume time_t uses a long int under the bonnet, and let's further 
> assume that it encodes seconds (a not uncommon implementation, as we 
> both know). On a 32-bit-long-int system, that gives us a range of 49710 
> days, which is 136+ years. Julian dates, on the same system, can cover 
> well over 11,000,000 years.
>
> I have no particular need for /millions/ of years, at least not yet, but 
> I find the ability to stretch back through the second millennium (and 
> even into the first) to be useful from time to time.

Desktop Unix-like systems these days tend to make time_t a 64-bit signed
integer.

On the other hand, 32-bit systems still exist.  They can still be
updated to use a 64-bit time_t, and I expect that's what will happen
between now and 2038, but so far I haven't heard of a system with 32-bit
long int and 64-bit time_t.

-- 
Keith Thompson (The_Other_Keith) kst-u@mib.org  <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something.  This is something.  Therefore, we must do this."
    -- Antony Jay and Jonathan Lynn, "Yes Minister"

Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

What about my last date functions? there are some error? Rosario19 <Ros@invalid.invalid> - 2016-11-08 11:28 +0100
  Re: What about my last date functions? there are some error? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-11-08 10:55 +0000
    Re: What about my last date functions? there are some error? "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-08 19:00 +0800
    Re: What about my last date functions? there are some error? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-11-08 11:04 +0000
      Re: What about my last date functions? there are some error? "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-08 19:22 +0800
    Re: What about my last date functions? there are some error? Richard Heathfield <rjh@cpax.org.uk> - 2016-11-08 11:35 +0000
      Re: What about my last date functions? there are some error? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-11-08 15:46 +0000
        Re: What about my last date functions? there are some error? Richard Heathfield <rjh@cpax.org.uk> - 2016-11-08 16:20 +0000
          Re: What about my last date functions? there are some error? Rosario19 <Ros@invalid.invalid> - 2016-11-08 17:44 +0100
            Re: What about my last date functions? there are some error? Richard Heathfield <rjh@cpax.org.uk> - 2016-11-08 16:51 +0000
              Re: What about my last date functions? there are some error? Jerry Stuckle <jstucklex@attglobal.net> - 2016-11-08 13:21 -0500
          Re: What about my last date functions? there are some error? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-11-08 18:06 +0000
            Re: What about my last date functions? there are some error? Richard Heathfield <rjh@cpax.org.uk> - 2016-11-08 18:56 +0000
              Re: What about my last date functions? there are some error? Keith Thompson <kst-u@mib.org> - 2016-11-08 12:05 -0800
              Re: What about my last date functions? there are some error? David Brown <david.brown@hesbynett.no> - 2016-11-08 21:10 +0100
                Re: What about my last date functions? there are some error? Richard Heathfield <rjh@cpax.org.uk> - 2016-11-08 20:16 +0000
          Re: What about my last date functions? there are some error? jadill33@gmail.com - 2016-11-08 11:16 -0800
            Re: What about my last date functions? there are some error? Richard Heathfield <rjh@cpax.org.uk> - 2016-11-08 20:08 +0000
            Re: What about my last date functions? there are some error? Keith Thompson <kst-u@mib.org> - 2016-11-08 12:11 -0800
              Re: What about my last date functions? there are some error? Keith Thompson <kst-u@mib.org> - 2016-11-08 12:29 -0800
      Re: What about my last date functions? there are some error? Rosario19 <Ros@invalid.invalid> - 2016-11-08 17:41 +0100
        Re: What about my last date functions? there are some error? asetofsymbols@gmail.com - 2016-11-08 11:26 -0800
          Re: What about my last date functions? there are some error? Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-11-08 19:38 +0000
  Re: What about my last date functions? there are some error? Keith Thompson <kst-u@mib.org> - 2016-11-08 08:19 -0800

csiph-web